Underfeed-stoker tuyere



Oct. 26 1926. 1,604,648

E. LUNDGREN UNDERFEED s'roxm TUYERE Filed N'v. 28. 1925 lllllll A A A 5 Ah 20 18 22 1 J6 l/l ATTORNEYS tion, of a tuyere structure embodying the Patented 'Oct. 26, 1926.

UNITED STATES I r 1,604,648 PATENT OFFICE. P

f EDWIN LUNDGREN, OF FREDERICK, MARYLAND, .ASSIGNOR TO COMBUSTION ENGI- NEERING CORPORATION, OF YORK, N. Y., A CORPORATION OF NEYV YORK.

unnnnrnnn-sroknn TUYERE.

Application filed Novem'ber28, 1928. Serial No. 677,503.

My invention relates to tuyere structures that are articularly adapted for use with stokers 0 the inclined underfeed type.

An .object of the invention is to provide a tuyere structure of this character with the use of which themost etficient'and economical burning of the fuel may be obtained.

Another object of the invention is to provide a tuyere structure of this character which is better adapted to withstand the heat of the furnace, and is otherwise more durable than those heretofore provided, resulting in decreased maintenance cost and shut downs for repairs.

Another object of the invention isto provide a tuyere of the character indicated having outlet channels through which the air is guided in such a manner that it is delivered to the fuel without sudden shock.

The several features of the invention whercby'the above mentioned and other objects may be obtained will be clearly understood from the following description and accompanying drawing, inwhich,

Figure 1 is a side elevation, partly in secfeatures of the invention-in their preferred form, the tuyere structure being'shown as mounted upon the wall of the retort, the retort wall being shown by broken lines;

Fig. 2 isa top plan view of one of the tuyeres shown in Fig. 1;

gig. 3 is a bottom plan view of the same; an

Figs. 4, 5 and 6 are sectional views taken on the lines 4- 1, 55, and 6-6 of Fig. 3, respectively.

The terms front and rear as employed herein in describing the tuyere structures, refer to the left and right hand ends thereof, respectively, viewing Figs. 1, 2, and 3 of the drawings,

The stoker tuyere illustrated in the draw-' ings comprises .a plate 2 having the forward portion 4 of its longitudinal sides substantially parallel and the rear portion 6 of its longitudinal sides inclined inwardly toward its rear end, the rear end of the tuyere being rounding. The under side of the plate 2 is provided with a depending rib 8 extending along the margin of thelongitudinal sides and rear end thereof, the forward end portions 10 of the rib being inclined upwardly and forwardly to the top surface of the plate. The tuyere plate is further provided with a central opening 12'having a reduced rear eridportion 14, and the under side of the plate is provided with a depending hookshaped lug 16 spaced between the rear end wall of the opening 12 and the regr end of the plate, and with lugs 18 arranged adjacent its forward end.

The tuyeres are arranged one upon the other with the rear end of each tuyere projecting a distancecbeyond the adjacent overlying tuyere, the inclined end portions 10 of 1 the rib 8 resting upon the retort walls which are indicated by broken lines at 20. The tuyeres are held in position on the retort walls by the engagement of the lugs 18 with suitably arranged sockets in the walls and narrow radially extending channels forming alternately arranged air passages 24: and

vanes 26. The longitudinal portions of the ribs 8 are provided with a plurality of relatively narrow channels that open out through the sides of the tuyeres and each is curved in wardly and forwardly therefrom, the chanalternately arranged air pasnels formin d vanes 30 of substantially the sages 28 an same w dth.

With this construction it will be apparent that the air admitted to the under side of each tuyere will pass out through the air passages 24 and 28, and that as these air passages and vanes, particularly the curved ength, a large cooling surface for the air is provided, and the air will pass therethrough to the fuel without sudden shock.

As the air passages and vanes are located adjacentthe longitudinal edge of the rear portion of the tuyere, which is where the tuyere casting is most affected by the heat of the furnace, the large cooling surface provided tends to prevent overheating of, this portion of the tuyere.

In order to still further increase the life of the tuyere casting the rear end portion of a-fssages 28 and vanes 30, are. of considerable each tuyereprojecting beyond the adjacent overlying tuyere and-which is exposed to the mcandescent fuel bed,-is raised at 32 a distanceabove the top surface of the body of the tuyere so as. to give a greater thickness of metal than otherwise available and thus give greater wear against corrosion of the metal, the rear portion of the top surface of the raised portion 32 being; inclined downwardly and rearwardly to the end of the tuyere so as to provide an effective fuel supporting surface.

As will be evident to those skilled in the art my invention ermits of various modifications Without teparting from the spirit thereof or the scope of the appended claims,

What I claim is: 1. A'stokertuyere of the class described comprising a plate having its longitudinal Sides inclined inwardly toward its rear enda larto the adjacent portions of the outer side of the rib, and having their inner end portions directed forwardly, the air passages at the rear end of the rib being arranged substantially radially, and the air passages in the longitudinal portions of the rib being curved inwardly and forwardly.

2. A stoker tuyere structure of the class described comprising a plurality of tuyere blocks arranged one upon the other with the rear end ofeach tuyere block projecting a distance beyond the adjacent overlying block, each 'tuyere block comprising a plate having the rear portion of its longitudinal sides inclined inwardly toward its rear end, and with the outer side of its rear end portion curved, the underside of said'rear portion of the plate having a depending marginal rib havingthe underside of its outer marginal portion substantially horizontal, the underside of said rib having a plurality of relatively narrow air passages extending transversely thereof and arranged in close proximity, the top side of each plate having a flattened portion of substantially the size and shape of the fiat underside of the rib of the overlying plate and upon which the rib rests, and the top surface of the rear end portidn of each plate having a raised portion inclined upwardly and rearwardly from a point adjacent to the extreme rear end of the overlying plate.

, EDWIN LUNDGREN. 

